8721487 has 2 divisors, whose sum is σ = 8721488. Its totient is φ = 8721486.

The previous prime is 8721481. The next prime is 8721499. The reversal of 8721487 is 7841278.

8721487 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8721487 - 2⁷ = 8721359 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8721481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4360743 + 4360744.

It is an arithmetic number, because the mean of its divisors is an integer number (4360744).

Almost surely, 2^8721487 is an apocalyptic number.

8721487 is a deficient number, since it is larger than the sum of its proper divisors (1).

8721487 is an equidigital number, since it uses as much as digits as its factorization.

8721487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25088, while the sum is 37.

The square root of 8721487 is about 2953.2163821840. The cubic root of 8721487 is about 205.8401924570.

The spelling of 8721487 in words is "eight million, seven hundred twenty-one thousand, four hundred eighty-seven".